"Average reference power" and "reference phase offset (rad)" parameters cannot be programmatically modified as of MATLAB 2024b.
However, the end result can be achieved by setting the existing “ReferenceConstellation” property of the “ScopeConfiguration” object to an appropriate numeric value (i.e., not as a preset such as 'QPSK' etc.).
To set the “ReferenceConstellation” and incorporate the desired values for "Average reference power" and "Reference phase offset (rad)" parameters, please follow the steps below:
Step 1: Obtain the “ScopeConfiguration” and store it in variable “cfg” using the following command:
>> cfg = get_param('<model_name>/Constellation Diagram', 'ScopeConfiguration')
You can now access the “ReferenceConstellation” property using the following command:
>> cfg.ReferenceConstellation
Step 2: The “ReferenceConstellation” property can be set to an appropriate numeric vector “val”, to obtain desired “Average reference power" and "Reference phase offset (rad)". This can be done using:
>> cfg.ReferenceConstellation = val
To construct the appropriate value (“val”) for “ReferenceConstellation” property, please refer to the example given for “Average Power Normalization for QAM” in the following documentation page: Quadrature amplitude modulation (QAM)
Example: In case of QPSK, a basic constellation can be obtained as follows:
>> valTemp = qammod(0:3, 4);
The desired "Average reference power" can be obtained by appropriately scaling “valTemp” using “K”. The desired "Reference phase offset (rad)" can be obtained by multiplying with a complex exponent “exp(j* phi)”.
>> val = K * valTemp * exp (j* phi);
Then you can set the “ReferenceConstellation” property to “val”.
>> cfg.ReferenceConstellation = val
Here is a link to a documentation article that shows how to control scopes with programming scripts: Control Scope Blocks Programmatically
